A 24 liter tank contains ideal helium gas at 27 degrees C anda pressure of 22 atm. How many moles of gas are in the tank?

a) 76

b) 238

c) 17.5

d) 21.5

e) 138

d) 21.5 moles

Explanation:

Given that

L = 24 L

T = 27 °C = 300 K

P = 22 atm

We know that ideal gas equation

P V = n R T

P=Pressure, V = Volume, n=Moles, R=Universal gas constant, T=Temperature

Now by putting the values

22 x 24 = n x 0.08206 x 300

n = 21.447 moles

n = 21.5 moles

Therefore the number of moles will be 21.5 moles.

The answer is "d".